drivers: make tegra-throughput driver always post fps
[linux-2.6.git] / drivers / misc / ad525x_dpot-spi.c
1 /*
2  * Driver for the Analog Devices digital potentiometers (SPI bus)
3  *
4  * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
5  *
6  * Licensed under the GPL-2 or later.
7  */
8
9 #include <linux/spi/spi.h>
10 #include <linux/module.h>
11
12 #include "ad525x_dpot.h"
13
14 /* SPI bus functions */
15 static int write8(void *client, u8 val)
16 {
17         u8 data = val;
18         return spi_write(client, &data, 1);
19 }
20
21 static int write16(void *client, u8 reg, u8 val)
22 {
23         u8 data[2] = {reg, val};
24         return spi_write(client, data, 2);
25 }
26
27 static int write24(void *client, u8 reg, u16 val)
28 {
29         u8 data[3] = {reg, val >> 8, val};
30         return spi_write(client, data, 3);
31 }
32
33 static int read8(void *client)
34 {
35         int ret;
36         u8 data;
37         ret = spi_read(client, &data, 1);
38         if (ret < 0)
39                 return ret;
40
41         return data;
42 }
43
44 static int read16(void *client, u8 reg)
45 {
46         int ret;
47         u8 buf_rx[2];
48
49         write16(client, reg, 0);
50         ret = spi_read(client, buf_rx, 2);
51         if (ret < 0)
52                 return ret;
53
54         return (buf_rx[0] << 8) |  buf_rx[1];
55 }
56
57 static int read24(void *client, u8 reg)
58 {
59         int ret;
60         u8 buf_rx[3];
61
62         write24(client, reg, 0);
63         ret = spi_read(client, buf_rx, 3);
64         if (ret < 0)
65                 return ret;
66
67         return (buf_rx[1] << 8) |  buf_rx[2];
68 }
69
70 static const struct ad_dpot_bus_ops bops = {
71         .read_d8        = read8,
72         .read_r8d8      = read16,
73         .read_r8d16     = read24,
74         .write_d8       = write8,
75         .write_r8d8     = write16,
76         .write_r8d16    = write24,
77 };
78 static int __devinit ad_dpot_spi_probe(struct spi_device *spi)
79 {
80         struct ad_dpot_bus_data bdata = {
81                 .client = spi,
82                 .bops = &bops,
83         };
84
85         return ad_dpot_probe(&spi->dev, &bdata,
86                              spi_get_device_id(spi)->driver_data,
87                              spi_get_device_id(spi)->name);
88 }
89
90 static int __devexit ad_dpot_spi_remove(struct spi_device *spi)
91 {
92         return ad_dpot_remove(&spi->dev);
93 }
94
95 static const struct spi_device_id ad_dpot_spi_id[] = {
96         {"ad5160", AD5160_ID},
97         {"ad5161", AD5161_ID},
98         {"ad5162", AD5162_ID},
99         {"ad5165", AD5165_ID},
100         {"ad5200", AD5200_ID},
101         {"ad5201", AD5201_ID},
102         {"ad5203", AD5203_ID},
103         {"ad5204", AD5204_ID},
104         {"ad5206", AD5206_ID},
105         {"ad5207", AD5207_ID},
106         {"ad5231", AD5231_ID},
107         {"ad5232", AD5232_ID},
108         {"ad5233", AD5233_ID},
109         {"ad5235", AD5235_ID},
110         {"ad5260", AD5260_ID},
111         {"ad5262", AD5262_ID},
112         {"ad5263", AD5263_ID},
113         {"ad5290", AD5290_ID},
114         {"ad5291", AD5291_ID},
115         {"ad5292", AD5292_ID},
116         {"ad5293", AD5293_ID},
117         {"ad7376", AD7376_ID},
118         {"ad8400", AD8400_ID},
119         {"ad8402", AD8402_ID},
120         {"ad8403", AD8403_ID},
121         {"adn2850", ADN2850_ID},
122         {"ad5270", AD5270_ID},
123         {"ad5271", AD5271_ID},
124         {}
125 };
126 MODULE_DEVICE_TABLE(spi, ad_dpot_spi_id);
127
128 static struct spi_driver ad_dpot_spi_driver = {
129         .driver = {
130                 .name   = "ad_dpot",
131                 .owner  = THIS_MODULE,
132         },
133         .probe          = ad_dpot_spi_probe,
134         .remove         = __devexit_p(ad_dpot_spi_remove),
135         .id_table       = ad_dpot_spi_id,
136 };
137
138 module_spi_driver(ad_dpot_spi_driver);
139
140 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
141 MODULE_DESCRIPTION("digital potentiometer SPI bus driver");
142 MODULE_LICENSE("GPL");
143 MODULE_ALIAS("spi:ad_dpot");